鋼塊偏析研究への高硫黄鋼の利用

概要

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Internal state of the high-S free cutting steel, weighing about 4t, was examined in detail. The segregation of elements and the distribution of inclusions were thoroughly explained ; the segregation was about the same degree as in ordinary steel ingots. In the maximum positive segregation zone near the top of the ingot, all the elements were found in higher concentrations than the average value. But in the inverted V-segregation zone, S and Cu were in positive segregation, while Mn, Si and O_2 in negative and that of C was not clear enough. In the V-segregation zone, the tendency was as in the inverted V-segregation, but not so clear because of its scarcity. In the so-called negative segregation zone in the lower middle part of ingot, the concentration of S, Cu and C were lower than the average, while that of Mn, S, and O_2 were extremely high. It was found out by microscopic examination that there were a few silicate inclusions in the inverted V-segregation zone and a great many in the negative segregation zone. It was observed that the investigation of a high-S steel ingot would provide us an easy clue to some hitherto-undiscovered features of the segregation in an ordinary steel ingot due to the conspicuousness of segregation in the high-S steel ingot.
社団法人日本鉄鋼協会の論文
1953-12-25